''Tropidonophis spilogaster'', commonly known as the northern water snake or Boie's keelback, is a

keelback Keelback may refer to any of the following snake genera: * ''Amphiesma'' * ''Amphiesmoides'', a monotypic genus in the Colubridae with its sole representative, the white-eyed keelback, ''Amphiesmoides ornaticeps'' * '' Atretium'', a monotypic genus ...

snake Snakes are elongated, Limbless vertebrate, limbless, carnivore, carnivorous reptiles of the suborder Serpentes . Like all other Squamata, squamates, snakes are ectothermic, amniote vertebrates covered in overlapping Scale (zoology), scales. Ma ...

in the family

Colubridae Colubridae (, commonly known as colubrids , from la, coluber, 'snake') is a family of snakes. With 249 genera, it is the largest snake family. The earliest species of the family date back to the Oligocene epoch. Colubrid snakes are found on ever ...

found in the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

on the islands of Catanduanes, Polillo, Calayan and in the province of

Bataan Bataan (), officially the Province of Bataan ( fil, Lalawigan ng Bataan ), is a province in the Central Luzon region of the Philippines. Its capital is the city of Balanga while Mariveles is the largest town in the province. Occupying the entir ...

on the island of

Luzon Luzon (; ) is the largest and most populous island in the Philippines. Located in the northern portion of the Philippines archipelago, it is the economic and political center of the nation, being home to the country's capital city, Manila, as ...

. The snake’s venom toxicity is unknown due to lack of study.

References

Tropidonophis Snakes of Southeast Asia Reptiles of the Philippines Endemic fauna of the Philippines Reptiles described in 1827 Taxa named by Friedrich Boie {{Natricinae-stub